#include "mymath.h"

int myerrno = 0;

int add(int x, int y) { return x + y; }

int sub(int x, int y) { return x - y; };

int mul(int x, int y) { return x * y; };

int div(int x, int y) {
  if (y == 0) {
    myerrno = 1;
    return -1;
  }
  return x / y;
};